A KOTE GE SOME iOIlKmN 
Dorsally and posteriorly each segment lias a square 
median black mark becoming more extensive and less 
well defined from that in the hinder segment. Segments 
8-10 black. Anal appendages black. Segments 2-3 are 
covered with a fine primrose deposit except on the black 
dorsal spot. This gives a bluish white appearance. 
Legs brownish yellow, darker at the joints; spines 
and terminal joints black. 
In a more adult specimen the whole of the front of 
the thorax is black, whilst the abdomen is almost 
entirely dark brown fading into black in the hinder 
segments. 
Traces of primrose markings of the same distribution 
as in the other specimen occur on segments 3 arid 4 of 
the abdomen. 
Wings in the more mature specimen slightly tinged 
with brown towards the tips. 
Readily distinguished from the two other species of 
the genus by the presence of a single row only of cells 
in the discoidal field of the fore-wing. 
O. xanthosoma appears to me to approach rather 
closely to the type of neuration found in Ris’ first Group 
of the Libellulince more closely than do any other 
members of his second Group. 
In the second more mature specimen there is a little 
more tendancy for the breaking up of the discoidal 
field in the fore-wing into two rows. But the single row 
character is still strongly marked, and I have no doubt 
is an invariable feature of the species. 
Type in the Sarawak Museum. Co-type in my own 
collection. 
All the species of the genus are found in Borneo. 
Haphisma met mis, Ris, Collect. Zool. Edm. de Selys 
Longchamps Ease. XI. p. 370. 
Female .—Internal triangle of 3 cells as in the male. 
Thorax dull brown with 3 lateral obscure dark me¬ 
tallic green lines. 
Abdomen very dark brown, fading in the posterior 
segments into black. The margins and carinae of the 
abdominal segments black. 
